If your priorities are reliability + low energy use, I’d focus on a separate front-load washer and heat-pump dryer rather than an all-in-one combo. Heat-pump dryers use substantially less electricity than conventional electric vented dryers, while keeping the washer and dryer separate avoids the throughput limitations of combo machines.
My top pick: 
LG front-load + heat-pump dryer
- LG WM4000HWA Front-Load Washer - $949.00 (LG)
- LG 7.8 cu. ft. Dual Inverter HeatPump Dryer - $1,249.00 (LG)
Why I'd choose this setup:
- LG WM4000HWA washer: 4.5 cu. ft., front-load, high-efficiency design and ENERGY STAR certified.
- LG heat-pump dryer: 7.8 cu. ft. and ventless, using LG's Dual Inverter HeatPump technology; LG says it can use up to 65% less energy for drying compared with conventional dryers.
- Separate machines mean you can wash one load while another dries, unlike an all-in-one.
- The heat-pump dryer is especially attractive if you do a lot of laundry or want to reduce long-term electricity consumption.
- Current listed pricing is roughly $949 for the washer + $1,249 for the dryer, though appliance pricing fluctuates.
A strong alternative: Electrolux
- Electrolux ELFW7637AT Washer - $1,182.00 (Walmart - Empire Appliances)
- Electrolux ELFE7637AT Dryer - $999.00 (Abt Electronics, Inc.)
The Electrolux pair is worth considering if wash performance and fabric care are particularly important. The washer is 4.5 cu. ft. and ENERGY STAR certified, while the 8.0-cu.-ft. dryer has moisture sensing and multiple fabric-care features.
One important distinction: the Electrolux dryer shown here is a conventional electric dryer, so I'd favor the LG heat-pump setup if minimizing electricity consumption is a major goal.
If you want maximum energy efficiency
I'd specifically look for this combination:
Front-load ENERGY STAR washer + ventless heat-pump dryer.
That's the configuration I'd target rather than paying extra for lots of smart-home features. A heat-pump dryer is the component that can make the biggest difference in electricity consumption.
If you tell me your budget (e.g. under $1,500, $2,000, $2,500) and whether you need stackable or side-by-side, I can narrow this to the 2–3 best sets available right now and compare warranty, energy use, capacity, and current prices.
